Anhydrous cerium(III) chloride — Effect of the drying process on activity and efficiency

The activity and efficiency of anhydrous CeCl 3 depend strongly on the drying procedure. Deactivation of CeCl 3 occurs during the drying process as a result of hydrolysis by the hydrate water, when heating above 90°C. The highly active CeCl 3, prepared by an improved drying procedure, is demonstrate...

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Bibliographic Details
Published in:Tetrahedron letters 1996-09, Vol.37 (37), p.6787-6790
Main Authors: Dimitrov, Vladimir, Kostova, Kalina, Genov, Miroslav
Format: Article
Language:English
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Summary:The activity and efficiency of anhydrous CeCl 3 depend strongly on the drying procedure. Deactivation of CeCl 3 occurs during the drying process as a result of hydrolysis by the hydrate water, when heating above 90°C. The highly active CeCl 3, prepared by an improved drying procedure, is demonstrated to activate rapidly (in catalytic and stoichiometric amounts) ketones at room temperature, providing excellent addition of organometallic reagents. The “slow drying” of CeCl 3·7H 2O (removing of at least ca. 80 % of the hydrate water in vacuo by heating at not more than 90 δ C ) is decisive for the obtaining of highly active anhydrous CeCl 3. The efficiency for activation of ketones with catalytic or stoichiometric amounts of CeCl 3, providing excellent additions of organometallics, is demonstrated.
ISSN:0040-4039
1873-3581
DOI:10.1016/S0040-4039(96)01479-7